Telephone-receiver.



No. 655,726. Patented Aug. I4, |900. W. J. MURDOCK.

TELEPHONE RECEIVER.

(Application led Apr. 11, 1900.)

(No Model.)

| 11 5 a V illlllllllll oikflllllllllI-lv- "l sl r integral therewith.

IVILLIAM J. MURDOOK, OF BOSTON, MASSACHUSETTS.

TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 5,726, dated August 14,19010. Application tiled April l1, 1900. Serial Ilo. 12.4.56. (Nomodel.)

T0 all whom t may concern:

Be it known that I, WILLIAM J. MURDocK, a citizen of the United States,residing at Boston, in the county of Suifolk and State of Massachusetts,have invented a new and useful Improvement in rlelephone-Receivers, ofwhich the following is a specitication.

My invention relates to a telephone-receiver or similar device in whichthe material of the shell, body, or casing is molded or cast about themagnet or other partse-as, for example, the binding-post sockets or theposts themselves or the suspending hook or ring` of the receiver ordevice.

It is the ordinary method to Iirst form the body, shell, or casing ofthe receiver and then to place the magnets, hooks, binding-posts, dac.,therein. This method is objectionable because it necessitates making theinsulating or body portions of the receiver in several parts, and eachsuch part requires a separate molding or forming operation. Then, again,the work of assembling the many parts is laborious, slpw, and expensive.Another great disadvantage of this method lies in the fact that the bestand most reliable construction is not obtained. The detachable andauxiliary retaining means, which usually consist of blocks of rubber andare ordinarily held in place by screws, are liable to work loose, thebinding-screws or other parts held by screws are apt to pull out, and adefective and objectionable instrument is the result. By my invention,however, I arneiibled to form the whole instrument at one operation, theshell, body, or case being molded or cast about all or as many of theother parts as desired. The parts are thus all secured, bound, and heldin place by the material of the case, all retaining lugs or portionsbeing formed This method dispenses with the various tedious andexpensive operations mentioned above, thus securing both a better and acheaper article.

In the accompanying drawings, which show several embodiments ofmyinvention and in which the same reference characters are applied tocorresponding parts throughout the several views, Figure 1 is a planview of a Watchcase-receiver with the cap and diaphragm removed andembodying my invention. Fig. 2 is a sectional view of the same Fig. 5 isa sectional view on the line c c ot' i Fig. 6, showing the inventionapplied to an ordinary Bell receiver, and Fig. 6 is an end view of thesame. Fig. 7 is a sectional view taken through one ot the binding-posts7 and showing the socket into which the binding-post is screwed.

The watchcase-receiver shown in Figs. 1

and 2 consists of a shell or case 2 of the ordinary shape and size.Within the same is a magnet 3, which may be the usual permanent magnetin instruments of this class and to which are attached by screws 4. thesoft-iron pole-pieces 5. On the latter are placed the coils or spools ofwire which cause the diaphragm to vibrate during the use of theinstrument. In practice the coils of wire are connected together and thcother ends of the coils are soldered to thin `oblong washers, throughwhich binding-posts '7 pass to mechanically and electrically connectthem to the sockets 8 of the binding-posts. This feature, however, isomitted from the drawings for the sake of clearness, as it forms no partof my present invention. On the inside of the shell or casing arecast ormolded integral therewith the projecting portions G. In these figuresthis portion 6 does not extend entirely around the inside of the shell,but is lacking at the points 9, so that the pole-pieces 5 may be readilyattached or removed. The parts 6, however, are of sufficient proportionsto firmly bind and hold the ring-magnet 3 in The projections 6 in theor'-` proper position. dinary watchcase-receiver are separate andremovable and are held in place by screws. In constructing this receiverthe magnet vis properly supported in any suitable way in the mold andthe material of which the shell is composed is molded or cast about it,thus forming .the projecting and retaining lugs G integral with theother parts of the shell. The pole-pieces 5, carrying the spools ofwire, are then placed in position and the receiver is Aready to beconnected up. The receiver is of course supplied with theusual'diaphragm lO and cap 11.

In the modiiication of my invention shown IOS in Figs. 3 and 4, which isa watchcase -receiver of the same general type as the former, theretaining and binding portions 6 extend entirely around the inside ofthe shell or case, as will be apparent by a reference to Fig. 3. This isconsidered a desirable embodiment of my invention, as neither thering-magnet nor thc soft-iron pole-piece can work loose or out ofadjustment after the receiver is once i connection with socket-head 14.

formed. It necessitates, however, attaching the pole-pieces to themagnet 3 before the shell iscast about the same. When this manner otmaking the receiver is employed, the spools or coils of wire arenecessarily slipped on over the pole-pieces after the receiver isformed, while in the construction formerly described the coils wereWound directly on the pole-pieces. This general mode of construction mayalso be applied to the ordinary Bell receiver as readily as towatchcase-receivers. One of this style so constructed is shown in Figs.5 and 6. AHere themagnet is indicated by 5 andthe pole-pieces on whichthe coils are Wound by `5", while the diaphragm and cap are shown of theusual construction and arrangement. The method of making the device isthe same as in the prey coils of wire are formed separate from thepole-pieces and are slipped on afterward when it is desired to completethe receiver.

In instruments of this class difficulty has arisen in rmly securing thebinding-posts, as the material of the case is not well adapted for theholding of screws. In my invention I avoid this difficulty by providingsockets for the binding-posts having enlarged heads or ends which arealso molded or cast into the material of the shell in the process offorming the latter. One way of doing this is indicated in Fig. '7, inwhich the bindingscrew 7 is shown inserted into aninternallyscrew-threaded socket 8, the latter being proment.

vided With an enlarged hexagonal head or end 14, around and over whichthe material of the shell is formed in molding. A hole 15 is also formedin the case, which extends to and into the hexagonal head of the socket.In the use of the instrument4 the bindingscrews 7 connect the coils withthe sockets 8 and the usual receiver-cord plug-terminals are inserted inthe holes 15 to make electrical It will be observed that a strongbinding-post attachment is thus secured, as kthe portion 8 may bereadily screw-threaded and the socket cannot pull out on account of thehead 14 being embedded in the shell. Itis to be understood, of course,that the posts 7 may themjselves be molded in the shell without thesocket S butI prefer the latter construct-ion. The same posts may beapplied to the receiver ot' Fig. 5 or, indeed, to any electrical instru-The ring 16, Figs. 1 to 3, is attached to the shell in the same way, andthe result is a complete receive-r, which is cheaper to manufacture andbetter than those ordinarily in use.

The invention is defined in the following claims:

l. A telephone-receiver comprising in its structure a shell or case ofinsulating material and a magnet for operating the diaphragm, the shellor case being provided with integral retaining portions projecting overand about the magnet, whereby thel same is rigidly supported and heldwithin'the case.

2. In a telephone-receiver, the combination of a s-hell of insulatingmaterial, a magnet, binding-posts, and a suspending hook or ring, theshell being provided with integral retaining portions extending overandaabout the several metallic parts whereby the same are irml y held inplace.

3. In a telephone-receiver, the combination of a shell of insulatingmaterial, a magnet having poles to influence the diaphragm, binding-postsockets having enlarged heads, and a suspending hook or ring, the shellbeing provided With retaining portions integral therewith whereby allother parts are firmly and permanently secured within the shell.

WILLIAM J. MURDOCK.

Witnesses:

FREDERICK B. HILL, RoBT. L. AMES.

IOO

